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Here is information about "twenty-one" that you may find useful and interesting. Number Systems Twenty-one is a decimal number and can be written with numbers: 21 Binary is a number system with only 0s and 1s. Twenty-one in binary form is displayed below: 10101 A Hexadecimal number has a base of 16 which means it includes the numbers 0 to 9 and A through F. Twenty-one converted to hexadecimal is: 15 Roman Numerals is another number system. Below is twenty-one in roman numerals: XXI Scientific Notation Sometimes calculators and scientists shorten numbers using scientific notation. Here is twenty-one as a scientific notation: 2.1E+01 Math Here are some math facts about Twenty-one: Twenty-one is a rational number and an integer. Twenty-one is an odd number because it is not divisible by two. Twenty-one is divisible by the following numbers: 1, 3, 7, 21 Twenty-one is not a square number because no number multiplied by itself will equal twenty-one. Number Lookup Twenty-one is not the only number we have information about. Go here to look up other numbers.

Translated Here we have translated twenty-one into some of the most commonly used languages: Chinese: 二十一 French: vingt et un German: einundzwanzig Italian: ventuno Spanish: veintiuno

Currency Here is twenty-one written in different currencies: US Dollars: $21 Canadian Dollars: CA$21 Australian Dollars: A$21 British Pounds: £21 Indian Rupee: ₹21 Euros: €21

Ordinal The cardinal number twenty-one can also be written as an ordinal number: 21st Or if you want to write it with letters only: twenty-first.

Twenty-two Go here for the next number on our list that we have information about.